Harry Redknapp is among the cast of the new I'm A Celeb series (Pic: PA)

Anne Hegerty, a quizzer from TV quiz show The Chase, and musician James McVey are the 6-1 joint second favourites.

"After weeks of speculation we now know who will be entering the jungle, and the surprise arrival of John Barrowman, who has gone straight in as favourite replacing Anne Hegerty, has really shaken up the betting," said Coral spokesman David Stevens.

"Harry Redknappis sure to be a huge character in the jungle this year and after he landed in Australia for what is sure to take part in I'm A Celeb, we have seen a flurry of bets for the former Tottenham manager to be the last contestant standing," added Coral colleague John Hill.